Abstract
The adsorption-desorption of oxygen on pure TiO 2 and RuO 2-loaded TiO 2 has been investigated at 305 K by means of a microcalorimetric technique. On pure TiO 2the oxygen is adsorbed reversibly, and the differential heat suggests that the process proceeds through physically adsorbed molecules; loading with RuO 2 causes irreversible O 2 chemisorption at low pressure while, at higher pressure, a process similar to that observed on pure TiO 2 occurs. The heats of exothermic desorption in the case of the loaded specimen may be interpreted by assuming the surface recombination of atomic oxygen.
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